Got Darrell's cylinder heads assembled today. SI valves, Comp Cams beehive springs, with Comp retainers, locks, seals, and spring seats. Spring pressures came in at 160 seat and 375 open, with a nominal 1.925" install height.
Also poured a couple of chambers and they came in at 80cc on the money with these valves and a set of AR3924 plugs.
Crankshaft is on the way, pistons are ordered, and the camshaft is ordered: Comp Cams billet steel hydraulic roller, 251/257 @ .050", .635"/.590" lift. 110 LSA.